Then play against a computer, a bot, or in OTB tournaments. Another thing you might do is find another thread with some form of the word "cheat" in the title. Read it if the "pencil inside a rectangle" is not showing in the upper right hand corner. Read down to see what's being done about it on here. There's a cheater's club or forum link for talking about it. It's not allowed in open forums.
online chess is broken

The perception of cheating levels is orders of magnitude more than the actual amount.
https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com
https://www.chess.com/article/view/online-chess-cheating
https://www.chess.com/article/view/chesscom-update-january-2025#FairPlay
The site closed more than 91,000 accounts in December for fair play violations and has a full team of staff working on reports along with some automated systems for detection.
https://www.chess.com/article/view/fair-play
That said, discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums. If you want to discuss join the following club, once your account has been open for at least 30 days
https://www.chess.com/club/cheating-forum
RIP chess!